Eye protection device against broadband high intensity light

Details Eye protection device against broadband high intensity light Eye protection device against broadband high intensity light

1989-01-13

1991-01-22

LaRoche, Eugene R.

350355, 350356, G02B 523, G02F 101, G02F 107

Patent

active

049866397

ABSTRACT:
An eye protection device against broadband high intensity light sources, including a fast response component (picosecond to microsecond) and a slow response component (microsecond and longer). The fast response component consists of two thin semiconductor layers "sandwiched" between two transparent electrodes. The natures and dimensions of the semiconductor layers and the voltage bias applied to them are determined such that enough photo-excited electrons are generated in the first small bandgap layer so that the second large bandgap layer undergoes a rapid insulator-to-metal transition at the light-intensity threshold for eye damage. Upon becoming metal-like, this layer blocks the incident light. Below the damage threshold, the fast response component is transparent. The slow response component includes a PLZT (lanthanum-modified lead zirconium titanate) or similar electro-optic shutter. This component is transparent below the damage threshold. Finally, ballistic and chemical protection are obtained by embedding these slow and fast response components in a suitable plastic goggle.

REFERENCES:
patent: 3524064 (1970-08-01), Keyes
patent: 3902061 (1975-08-01), Harris
"PLZT Electrooptic Shutter: Applications," J. Thomas Cutchen et al., Applied Optics, vol. 14, No. 8, Aug. 1975.
"Semiconductor Optical Shutter," R. H. Vought, R. L. Thompson, General Electric Company, Dec. 1966, Contract AF41(609)-2899, Project Task No. 630103.
"Recent Improvements in the Optical and Electrooptic Properties of PLZT Ceramics," G. H. Haertling and C. E. Land, Ferroelectrics, 1972, vol. 3, pp. 269-280, IEEE Trans. Sonics & Ultrasonics, SU-19, pp. 269-280.

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